All listed performances have at least one source from those below.
One or more programmes were found for 33% of works. Some were present in Margaret's effects, most of the others in collections at the British Library. Many programmes for SPNM concerts, in which Margaret played frequently, are missing from the BL collections, particularly for the earlier years. The British Music Collection in Huddersfield acquired the SPNM archive but it is uncatalogued and not currently accessible.
Reviews were found for 33% of the works, the majority in The Musical Times or in British and Swiss newspapers whose archives are searchable online.
Scores with Margaret's annotations were available for 20% of the works in the Performances list. Almost all are held in the Margaret Kitchin collection at the Royal Academy of Music. Some works that Margaret are known to have performed have no annotated performances, but most of the remaining 80% are missing. Studio recordings give the recording date. From the handwriting and occasional alterations and insertions, some entries were evidently made years later; see for example Goehr sonata no.2, Banks violin sonata, Henze concerto and Tippett's The Heart's Assurance.
BBC radio broadcasts
Listings in Radio Times between 1923 and 2009 are available online in the BBC genome. Out of 237 radio broadcasts that identify Margaret as a performer, 76 give no details of the works performed, and some of the others have incomplete information. We are currently researching these at the BBC Written Archives Centre and expect to finish shortly. There are also 48 recordings in the British Library Sound Archives, though many do not identify the broadcast.
Recordings exist for 7% of the works. Margaret did not make many commercial recordings and the majority are taped from BBC radio. The Lyrita Recorded Edition Trust has released one radio broadcast on CD (the Hamilton concerto); we hope further releases will be forthcoming.
A Dictionary-Catalog of Modern British Composers, Alan Poulton (2001)
A catalogue of works by 54 British composers born between 1891 and 1923, in three volumes. Gives details of all known first performances (f.p., f.broad.p, f.Brit.p., etc.), accounting for 7% of works in the Performances list.
A Chronicle of First Broadcast Performances of Musical Works in the United Kingdom, 1923-1996, ed. Mitchell and Poulton (2000)
Contains information taken from the BBC Programme-as-Broadcast log. Less complete than the volumes above. Our own scrutiny of these logs (see above) has uncovered a few additional premieres.
Neue Musik in alten Mauern: Die "Gattiker-Hausabende für zeitgenössische Musik" – Einer Berner Konzertgeschichte 1940-1967, Doris Lanz
History of a long-running series of contemporary music concerts in Bern. Includes peformances by Margaret between 1942 and 1950, comprising 10% of the works in the Performances list. For two concerts in which another pianist took part we are unable to deduce which part of the programme Margaret played; these works are listed in other repertoire.
Some information on Margaret's performances in Switzerland and Europe in the 1940s was found in letters held at the BBC Written Archives Centre.
Advertisements, articles, books, and catalogues. A few works have no other source.